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Home > Noritz Water Heater Reviews > Reviews of N-0931 (NR111)

Noritz Tankless Water Heater Reviews

Noritz N-0931M (NR111) on demand hot water heaters

Noritz tankless water heater N-0931M models are gas appliances with the highest capacity for one single unit; ideal for multiple bathroom houses and homes with high hot water demand, such as using up to 4+ applications at the same time.

High capacity

You can freely use Noritz water heater N-0931 (NR111) for two showers, washing machine and dishwasher at the same time, without worrying that you will run out of hot water or have unpleasant cold water sandwiches. Thanks to the Turbo-Flow system, high 11.1 gallons per minute can be reached to meet your demand.

Note: You will notice that Noritz N-0931M (NR111) models aren't Energy Star verified as the recognition applies for units with the gas input up to 199,999 BTU. These units are so powerful that are providing terrific 250,000 BTUs with the thermal efficiency of 84 % for both natural gas and propane or LP gas.

Top features

Even more power and hot water can be achieved with Quick-Connect system where two tankless units can be linked together. In order to keep its efficiency, meet higher water demand and provide stability in output temperature, Noritz has designed special high quality heat exchanger and piping with the Noritz exclusive dual flame burner.

Noritz tankless water heater N-0931M (NR111) is designed with the multi safety system, to protect users and the tankless unit from breaking. Even with the option to heat water to max of 180 F, (82 C) safety lock out system prevents scalding water and burns with factory set temperature of 120 F or 49 C.

To make Noritz tankless water heater even safer, several safety devices are built in. Thermal fuse automatically protects these units from overheating and freezing is prevented by the freeze-prevention heater, no matter is the unit on or off.

Other safety devices that are standard equipment are:

Overheat prevention device
Fan rotation detector
Flame rod
Lighting protection device
Pressure relief valve
Electric leakage prevention device

What controls the stability of the output hot water is fully modulating gas valve that adjusts the gas flow and burner level according to the output hot water temperature and demand.

N-0931M (NR111) models

Based on the venting options there are three wall hanging Noritz tankless hot water heater models you can choose from. All of them are power vented, which means that flue gases are forced out and the low pressure in the combustion chamber sucks the air in.

They can be used for installations up to 4500 ft or 1.5 km above sea level.

N-0931M (new model number is NR111-SV)

N-0931M-DV (NR111-DV)

N-0931M-OD (NR111-OD)

Note: Proper venting is required to protect the heater from corrosion and gas leak in the exhaust vent. Therefore stainless steel pipe is required for venting gases out (Category III).

Noritz Tankless Water Heater N-0931M (NR111-SV)

N-0931M (NR111-SV) is a standard model that can be installed indoor and outdoor, and vented horizontally or vertically. When installing inside, sufficient air supply should be provided as it is using the inside air for combustion and one flue pipe for venting gases out.

Outdoor vent cap is recommended to use. For vertical roof vent penetration, recommendation is to use a rain cap at the end of the vent.

Birdscreen is an option for both horizontal and vertical vents, a solution that keeps birds from entering inside the vent pipe.

N-0931M (NR111-SV) models cannot be used in RV, boat or mobile and manufactured home applications.

Model N-0931M-OD (NR111-OD)

Noritz N-0931M-OD (NR111-OD) units are built for outdoor installation only as they don't require venting pipes. Recommendation is to install them in the recess box and protect them from different weather conditions. These models can be used for residential, commercial or in manufactured home application, but not in RVs or on a boat.

Once installed outside, Noritz outdoor model is exposed to lower and freezing temperatures. That is why you should not remove the power plug from the electrical outlet. The freezing device protects the unit only, not plumbing. For extremely cold weather and if the unit is not used for a while, the best solution is to drain the whole unit.

Model N-0931M-DV (NR111-DV)

Noritz N-0931M-DV (NR111-DV) has to be installed indoor only. To prevent products of combustion to leak in the room and to use inside air for gas combustion, combustion chamber is sealed. These Noritz tankless water heater models are perfect for installation in the smaller rooms, where other non-combustion sealed models installation is not viable option.

They use either one concentric vent pipe, where the inside stainless steel pipe is used for venting gases out and outside for air intake. Two separate pipes can also be used, one as the intake pipe and the other stainless steel pipe to vent gases out. It all depends on installation preference and viability.

N-0931M-DV (NR111-DV) models are suitable to be used in residential, commercial and manufactured home application, but not in RVs or on a boat.

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